As the D-body uses two (2) belts and retractors to the B-body's single belt design I believe they are not crossoverable. This has been covered more than once before so Search may be your friend. It might also confirm I'm FoS in case a B-body turns out perfectly suitable for at least one of the two Cady assemblies. But I don't think so.
I have used a mailorder repair service with painless success (about $90 and 5 days), but you can likely find a JY donor if patient.
Oh and different brand bits fit different. You don't want to round off the socket head too many times eh. Something about a 'bottoming flat' type will not bed deep enough for grip??, and someone's 50 is another one's 49. One of the 3 I have that takes a hammer tap to seat and I like that one best.
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!